再生混凝土研究及再生混凝土柱力学性能分析

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1、西南交通大学研究生学位论文再生混凝土研究及再生混凝土柱力学性能分析焦姓级名二oo五级张军申请学位级别工学硕士专业桥梁与隧道工程指导教师叶跃忠教授二oo七年六月西南交通大学硕士研究生学位论文第1I页AbstractWiththerapiddevelopmentofthebuildingindustry,thewasteofbuildinghavebeengrowingdaybyday，andmostofthemarewasteconcrete．Besidesthechargeforallabundanceofwastedisposalisver

2、ymuch，italsoisharmtotheenvironmentandsociety．Inaddition，thelargedemandofconcreterequesttheexploitationofnaturalresources--sandandstone，andSOthenaturalresourceshasbeenontheexhaustededgefortheunceasingexploitation．Moreover,besidestheexploitationandtransponationofnaturalsandan

3、dstoneexpandslargely，italsodestroystheenvironmentbadly．TherecycledconcretebasedonenvironmentprotectionandsustainingdevelopmentCansettletheproblem．Thispaperfirststudiesthephysicalpropertiesofrecycledconcreteandnatureconcrete，andtheaxialcompressionoftherecycledconcretecolumns

4、andthenatureconcretecolumnsiS￡liscussed．Onthephysicalproperties，thepaperstudiesparticlesizedistribution，apparentdensity,voidfraction，waterabsorptionandcrushingvalueoftherecycledaggregate，andcomparesthemwimthatofthenaturalaggregate．andanalysesthereasonscausingdifferencesbetw

5、eenthetwokindsofaggregate．Allexperimentstakeorthogonalexperimentdesignandeachconcretemixtureratioconsidersthreeinfluencesfactors，includingtherecycledcoarseaggregate，FDNandflyash．Thenweanalysesthatthethreefactorshaveaneffectontheworkabilityandmechanicalpropertiesofrecycledco

6、ncrete．Onthestructure，theaxialcompressionoftherecycledconcretecolumnsisexperimentallyinvestigated,thefailuremodesandloadingcapacityofthemaremainlydiscussedandcomparedwiththenatureconcretecolumns．Intheduring,thestrainofthecolumninsideandoutsideisbemeasuredandthedifferenceoft

7、hemisanalyzed．Inthelastofthepaper，thedifferenceoftherecycledconcreteandthenatureconcr吐eisanalyzedinthemicrostructureandwecomparetherecycledconcretewiththenatureconcreteintheeconomyandenvironment．Inconclusion，itisfeasiblethattherecycledconcreteisappliedinthestructure．K卵燃呶Rec

8、ycledconcrete；Column；Physicalproperties；Axialcompression；Microstructureanalyses西南交